Automatic reversing mechanism for tool-holders



AUTOMATIO .RBVERSING MEGHANISM P OOOOOOOOOOOO S.

UNITE STATES PATENT OFFICE.

ALANSON D. QUINT, OF HARTFORD, CONNECTICUT.

AUTOMATIC REVERSING MECHANISM FOR TOOL-HOLDERS.

SPECIFICATION forming part of Letters Patent No. 564,223, dated July 21,1896.

Application filed April 16, 1896. Serial No. 587,820. (No model.)

To all whom it may concern."

Be it known that I, ALANSON D. QUINT, a citizen of the United States,residing at Hartford, in the county of Hartford and State ofConnecticut, have invented certain new and useful Improvements inAutomatic Reversing Mechanism for Tool-Holders, of which the followingis a specification.

The invention relates to a device which can be used, in connection witha lathe or with a drill-press or drilling-machine, for holding acutting, boringg'drilling, or tapping tool, as the case may be, in suchmanner that the di rection of rotation of the tool may be changed I 5without changing the direction of rotation of the driving-spindle.

The object of the invention is to provide a simple device of this'classwith means which can be so adjusted and set that at any predeterminedtime the direction of rotation of the tool will automatically bereversed without changing the directionof rotation of thedriving-spindle.

To this end the invention resides in a device having a tool holder orchuck that is loosely 0 sition is positively clutched by the head androtates with it in the same direction, but when in its other positionwill be rotated by intermediate mechanism that is supported by the head,in a reverse direction from the direc- 5 tion of the rotation of thehead, with a dog connected to and movable with the toolholder, so as toengage with and bring into operation or disengage from and stop theoperation of the intermediate reverse rotating 4o mechanism, and a tripdevice or foot which can be so adjusted that at the desired moment thetool-holder and the connected dog will be caused to make the properconnections for reversing the direction of rotation of the tool,

as more particularly hereinafter described,

and pointed out in the claims.

Referring to the accompanying drawings, Figure 1 is a sideview of themechanism arranged as applied to the head and spindle of a verticaldrill, showing the relative position occupied by the parts when a holeis being tapped. Fig. 2 is a similar View with the parts shown in theposition occupied when the tap is running in a reverse direction tounscrew from a perforation which has been threaded. Fig. 3 is asectional view taken on the plane indicated by the broken line X X ofFig. 1, looking downward; and Fig. 4 is a sectional view taken on theplane Y Y of Fig. 2, looking upward.

In the views, 1 indicates a section of a head-stock of a lathe or thesleeve of a drillpress or other stationary part of a drillingmaohine inwhich the ordinary live-spindle 2 of such a machine is rotarilysupported. In these views the sleeve is shown standing vertically, as ifbroken from a part of a drillpress, but it can, of course, be arrangedhorizontally as well as vertically.

In the usual opening in the end of the livespindle 2 is thrust and heldin a common manner the tapering shank 3 of a reversing tap-holder. Thereversing tap-holder illus trated is of a common form and can beobtained in themarket. It has a head 4 with a loose sleeve 5 and theprojecting clutchpins 6 and the interior gears, as shown in UnitedStates Letters Patent- No. 531,382, dated December 25, 1894:.

The head supports the shaft 7, that bears the tool holder or chuck 8,which in the drawings is holding an ordinary tap 9. This shaft 7 isillustrated as provided with a collar 10 with projecting clutch-pins 11,adapted to make contact with the pins 6, projecting from the head. Theshaft is arrangedto move a limited distance longitudinally into and outof the head, and when moved into the head the pins 6 and the pins 11engage, as shown in Fig. 1. When in this position, the shaft, head, andsleeve will rotate as one part, the spindle rotating the head, and thehead, through the clutch-pins, rotating the shaft with the tool-holder,so that the tool will rotate in the same direction as the live-spindle.WVith the shaft drawn out from the head the pins are disengaged, asshown in Fig. 2, and then when the sleeve 5 is held against movement theshaft is, through the action of the intermediate gears, arranged in theinterior of the head, as in the common form of reversing tap-holderreferred to, and shown in said patent, giving a movement ina directionopposite to the direction of rotation of the head,

so that while the spindle continues to rotate in the same direction thetool will be rotated in the reverse direction.

Connected with the collar 10, that is borne by the moving shaft 7, is abar 12. The bar preferably has one end forked and is so located that theends of the fork loosely engage a groove in the collar. lVith thisconnection when the collar is moved longitudinally the bar is moved withit, but the bar, which does not rotate, will not interfere with the freerotation of the collar.

Connected with the bar 12 is a rod 13, that bears a block or dog 14.Nuts 15 are preferably used to secure the rod to the bar, so that therod may be adjusted lengthwise to regulate the distance between the barthat engages the collar on the tool-holder shaft and the dog which isheld by the rod. One end of the rod is loosely supported in aperforation in an arm 16, that is clamped to the sleeve 1 or otherstationary part of the machine. In a perforation in this arm 16 issupported a post 17, which post is held in position by a set-screw 18,which can be loosened for permitting of an adjustment of the post andthen set for clamping the post in that position. 0n the end of the postis a trip or foot 19, that is arranged to project into the path of thestock being operated upon. Preferably this foot is perforated and thetool is passed through the perforation, as shown in the views. I

On the sleeve 5 is a block or stud 20. This block is located so thatwhen the dog is in one position the block will revolve with the sleevefreely; but when the dog is in another position the block will engagethe dog, so that the block and sleeve cannot revolve. With thetool-holding shaft thrust into the head and the clutch-pins 011 the headand collar on the shaft in engagement, so that the spindle, head,sleeve, and tool-holding shaft with the tool all rotate in onedirection, as shown in Fig. 1, the dog 1i is in such a position that theblock 20 during revolution passes free from the dog. \Vhen thetool-holding shaft is drawn out of the head and the clutch-pins aredisengaged, as shown in Fig. 2, the collar on the tool-holding shaft isdrawn away from the head and this draws the dog on the rod connectedwith the collarinto the path of the block on the sleeve, so that theblock makes contact and is held against rotation by the dog.

As above described, with the sleeve held against rotation as it will bewith the block engaging the (log and the clutch-pins disengaged, thetool-holding shaft will be rotated in an opposite direction from therotation of the head. Thus the spindle will continue to rotate in thesame direction while the direction of rotation of the tool will bereversed.

YVhen a tap or other tool is started into a piece of work, the pressureon the end of the tool, whether the tool is fed to the work or the workfed to the tool, forces the tool-holding shaft into the head, so thatthe clutchpins engage, as shown in Fig. 1, and the tap rotates forwardwith the live-spindle of the machine. \Vhen the tap has fed into thework the proper predetermined distance, according to the adjustment ofthe foot or trip, and the face of the work makes contact with the trip,the-continued rotation of the tap, as the work cannot feed further 011the tap on account of the trip, causes the holdingshaft to be drawn outof the head and the clutch-pins disengaged, which, as previouslydescribed, also draws the dog into the path of the block on the sleeve,so that the sleeve will be held against rotation, and then the tapimmediately begins to rotate in a reverse direction through themechanism referred to and turns itself out of the work. The dogrod is soattached to the bar connected with the tool-holding-shaft collar thatthe distance between the collar and the dog can be readily and nicelyadjusted, insuring that the dog engages the block on the sleeve at theproper time, and the trip is readily adjusted, so that the depth ofentrance of the tap into the work can be accurately regulated. 7

By means of this device a perforation can be tapped to any desiredpredetermined depth and then the tap reversed automatically, so that itwill withdraw from the threaded hole, and the outward movement ispreferably much more rapid than the inward.

The device is very simple, it is easily adjusted, it operatesautomatically, and it can be used in connection with a lathe or with adrill-press, drilling-machine, or other boring or perforating machinearranged to feed the tool to the work or the work moved to the tool,either vertically or horizontally, the only change necessary being theshape of the clamping part which holds the arm 16.

I claim as my invention- 1. In combination in a reversing tool-holder, ahead adapted to be connected to and to rotate in the same direction witha live-spindle, a tool-holder movably supported by the head, clutchmechanisms for joining the tool-holder with the head so that they rotatein the same direction when the tool-holder is in one position, reversingmechanisms for rotating the tool-holder in the opposite direction whenthe clutch mechanisms are disengaged, and a dog connected to and movablewith the tool-holder and adapted to travel into or out of the path of apart of the reversing mechanisms according to the position of thetool-holder, substantially as specified.

2. In combination in a reversing tool-holder, a head adapted to beconnected to and to rota-te in the same direction with a live-spindle, atool-holder movably supported by the head, clutch mechanisms for joiningthe tool-holder with the head so that they rotate in the same directionwhen the tool-holder is in one position, reversing mechanisms forrotating the tool-holder in the opposite direction when the clutchmechanisms are disengaged, a dog 0011-" nected to and movable with thetool-holder and adapted to travel into or out of the path of a part ofthe reversing mechanisms according to the position of the tool-holder,and a trip device adapted to engage the work so as to cause thetool-holder to draw the dog into position to engage a part of thereversing mechanisms, substantially as specified.

3. In combination in a reversing tool-holder, a head having a shankadapted to be connected to and to rotate in the same direction with alive-spindle, a shaft bearing a toolchuck and a collar, movablysupported by the head, clutch mechanisms for joining the collar'with thehead so they rotate in the same direction when the shaft is in its innerposition reversing mechanisms supported by the head for rotating theshaft in the opposite direction when the clutch mechanisms aredisengaged, a dog adjustably supported by a rod that is looselyconnected with the collar on the shaft, a sleeve on the head connectedwith the reversing mechanisms, a block on the sleeve adapted to makecontact with the dog when the clutch mechanisms are disengaged, and atripping-foot borne by a post adjustably supported by an arm adapted tobe connected with a stationary part of the machine with which the deviceis to be used, substantially as specified.

ALANSON D. QUINT.

Witnesses:

H. R. WILLIAMS, E. J. HYDE.

